Invites
When someone shares a document with your e-mail address, you get an invite. Nothing is shared until you accept. This accepts every invite waiting for the verified e-mail address you are signed in with.
Documents shared with you
Signed in as an unknown email (not verified — accept will be refused).
No invites accepted in this tab yet
Ask a colleague to share a document with your e-mail address from its document page, then press Accept invites.